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Register a new userEvaluation The Efficiency of a Suggested Model in Emulation The Behavior of R.C. Beams Strengthened with GFRP Strips
تقييم فعالية موديل مقترح لمحاكاة سلوك جيزان بيتونية مسلحة مدعمة على القص بشرائح GFRP
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وعد ابراهيم الخطيب( باحث )
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يتناول بحثنا هذا دراسة تجريبية تحليلية تهدف تقييم فعالية موديل عناصر منتهية مقترح لمحاكاة سلوك جيزان بيتونية مسلحة مدعمة بشرائح(GFRP)-Glass Fiber Reinforced Polymers البولمرات المسلحة بألياف الزجاج- من خلال دراسة طاقة التحمل القصوى لهذه الجيزان و آلية تشققها و انهيارها بالإضافة لمنحنيات حمولة-سهم و ذلك باختبار تسعة جيزان بيتونية مسلحة بسيطة الاستناد أبعاد كل منها 200x30x16 cm قسمت لثلاث مجموعات الأولى معيارية تضم ثلاثة جيزان معيارية، و الثانية تضم ثلاثة جيزان مدعمة بشرائح شاقولية جانبية من GFRP، و الثالثة تضم ثلاثة جيزان مدعمة بشرائح جانبية من GFRP مائلة بزاوية 45°عن محور الجائز، و اقتراح موديل حجمي من العناصر المنتهية لمحاكاة سلوك هذه الجيزان باستخدام برنامج ANSYS10، و مقارنة هذه النتائج التي أثبتت فعالية الموديل المقترح في محاكاة سلوك الجيزان المختبرة حيث توافقت مع النتائج التي حصلنا عليها تجريبياً.
Our Paper is a laboratory modeling research to evaluate the efficiency of finite element model in emulation the behavior of R.C. beams with shear deficiencies (ultimate load, mechanism of cracking and failure, load-deflection behavior) strengthened with GFRP strips. We tested nine R.C. beams 200x30x16 cm in three groups, the first consists of three R.C.beams for comparing, the second consists of three strengthened R.C. beams with two sides vertical GFRP strips, and the third also consists of three strengthened R.C. beams with two sides inclined (45°) GFRP strips. We modeled these beams by advanced finite element program Ansys10, and we get results agreed with our laboratory study.
References used
ACI 440, American Concrete Institute, "State of the Art Report of fiber reinforced plastics (FRP) reinforcement for concrete structures", American Concrete Institute, Farmington, Michigan, 2002
ACI 546, American Concrete Institute, "Concrete Repair Guide", American Concrete Institute, Farmington Hills, Michigan, 2001
ANSYS, "ANSYS Users Manual Revision 10", ANSYS Inc., Canonsburg, Pennsylvania, 2005
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Beams are considered as one of the most loaded concrete elements, which needs to
be strengthened either as a result of insufficient of concrete section, or insufficient rebar or
increased loads, or the result of a superficial steel or corrosion of
internal steel
reinforcement, and other reasons that we will mention them what we need to study this.
The damaged structural elements and their inability to function fully as a result of exposure
to different environmental factors damage materials and lead to lower resistance, or
because of the existence of of an executive defects or inappropriate investment for its,
leads to the need to rehabilitate maintenance and repair or reinforcement. So it was
resorting to strengthen either magnify sections or supply necessary reinforcement or steel
platelets linking external supported well to concrete section, and because of the difficulty
of execution the recent studies has been implemented on the use of more efficient material
which is concentrated fiber reinforced polymers.
We will present here to methods of strengthening the shear up to the global studies
conducted using these materials from polymers, which are characterized by high resistance
to tensile and large resistance to environmental factors and weather conditions and ease of
application in the specified permissible sites.
Analysis of The results for one of the most important
experimental tests on masonry arches strengthened at their
extrados or at their intrados by fiber reinforced polymer
(FRP)strips;shows that the presence of the fibers prevents the
brittle coll
apse that occur in plain arch because of formation of
four hinges, therefore (depending on position and amount of
reinforcement) in strengthened arches, there are three possible
mechanisms : 1- masonry crushing , 2- detachment of fibers, and
3- sliding along a mortar joint due to the shear stresses. Some
analytical approaches describing these mechanisms are discussed
and a comparison between the theoretical values that give and
the experimental results was performed to show the agreements ,
according to analytical study of the experimental results
strengthening by fibers enhances the strength and ductility of
strengthened arches, the width of strips and the bond between
them and masonry are so important to perform optimum
strengthening.
This research deals with analytical study of exterior Beam-Column
connections behavior under seismic load.
Tow parameters were considered: axial load on the column and
confinement of joint region with stirrups.
Ansys program was used to analytica
l study of three types of exterior
Beam-Column connections under cyclic load.
The results were shown a good agreement with general behavior of
three types.
The analytical results indicate that the tow parameters will improve
the behavior of the connections delay cracking at joint core and
increasing connection stiffness in rotation and displacement with
decreasing shear value at joint.
This research aims to study the efficiency of flexural strengthening of RC beams with different lengths of CFRP strips by using (NSM) technique. The study is carried out experimentally on (14) concrete beams; the variables considered are (the length
and number of CFRP strips). This is established by dividing the work into two groups: the first one includes (6) beams strengthened by variable carbon fiber strip lengths and one strip, The second group includes (6) beams strengthened by variable carbon fiber strip lengths and two strips, as well as two control beams. The results indicate that carbon fibers have a noticeable effect on increasing the bearing capacity of (NSM) strengthened beams. The results also show that strengthening the beams by CFRP and not along the length of the beam and in one layer does not contribute to increasing beam strength, but when the number of layers increases, an increase in beam strength is noticed at a rate range (40%-72%).
Many techniques have been used in repair and strengthening of
reinforced beam, among which are external steel beams, external
pre- stressing, epoxy injection, additional concrete overlay, external
steel plates, additional longitudinal and transver
se - steel bars.
Fifteen R.C. beams were tested until failure and the deflection,
surface strains, internal steel strains, external steel strains and crack
patterns were measured, the results were analyzed and conclusions
were summarized. Finally, the recommendations were stated with
the needed future work.
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